William a



tetta WILLIAM A. TERRY, OF

BRISTOL, CONNECTICUT.

Letters Patent No. 79,026, dated ,Tune 16, 1868 reissue No. 4,213, datedDecember 20, 1870.

IMPROVEMENT IN CALENDAR CLOCKS.

The Schedule referred to in these Letters Patent and making part of thesame.

I, WILLIAM A. TERRY, of Bristol, in the county of Hartford and State ofConnecticut, haveinvented a new and useful Improvement in Calendars forClocks, of which the following is a specification.

The object of my invention is to make a calendar to be attached toclocks, which shall be more simple, durable and economical than thosenow in useand he more easily set and regulated when the clock has beenstopped from any canse.

My invention consists iu arranging on one arbor or common axis twowheels, one of which has thirty-two teeth, and the other forty-eight;or,if desired to make the calendar for one year only, it has twelve, insuch a manner that the relative change of one tooth or division iu saidwheels shall be made at the end of each month.

It also consists iu attaching an index or pointer to the month-wheel,which revolves with it, and indicates the days of the mouth hy suitableEgures upon' the dial, and iu attaching a circular disk, marked with themonths of the year and for a perpetual calendar, with,

leap-year; and the three years immediately succeedingr said year, to theyear wheel, so that the differential movement between the wheels shallindica-te the successive months and also the year relative to leapyear.

It also consists in thc peculiar mechanism for reg` ulating the movementof the month-wheel, so that the index shall register the proper numberof days in each month, and complete one full revolution in cach monthwithout regard to to the number of days in it. 'lhis peculiar mechanismconsists in part of the pawl hereinafter described, and of thearrangement of the year-wheel in this particular combination upon astationary axis, so that the changes of the year-wheel which operate theindicator shall take place between the last day of one month and thefirst day of the next mouth.

It also consists in the employment of one or more extra teeth, inaddition to thirty-one in the mouthwheel, in combination with themechanism for moving said month-wheel forward at the end of the mouths.

In the accompanying drawing- Figure l shows the calendar as it appearson the' face of the clock.

Figures 2 and 3, the parts ofthe mechanism of the calendar separatedfrom the dialand index.

Figure 4, an edge view of the mechanism of the calendar; and

Figure 5, together with fig. 4, the manner in which the index of thecalendar is secured to the socket.

A is the disk, attached to the year-wheel C, or set firmly on the samearbor ou which are marked the mouths of the' year.

This is shown in the drawing as marked for four years, with forty-eightmonths, leap-year, and the first, second, and third year after.

B is the index or pointer attached to the arbor of month-wheel D, whichpasses through that of the year-wheel.

The relative position of these wheels and the disk is shown iu fig. 4.

In figs. 2 and 3 the wheel C is shown removed from the top of the wheelD, so as to show the parts more clearly.

attached to the clock movement. v

This has upon it two pins, b and c, for moving and operating thecalendar.

The pin c engages with and moves forward one tooth of the wheel D ateaohrevolution of E.

The pin b is shorter than c, and passes under the wheel D, and engageswith the pawl a' when the revolution ofD brings it to the properposition.

a. a' is a pawl or dog with one arm, a., on one side of the wheel D, andthe other, a', on the opposite side, connected together hy an axispassing through the the wheel.

This pawl or dog is for the purpose of taking up and passing over theextra teeth in the wheel D for months having less than thirty-one days.

It also serves to take up the thirty-second tooth of the month-wheelwhile the index changes for the next month.

The wheel D has thirty-two teeth, for the 'purpose of causing thedifferential movement of the wheels D and C to take place while the pawlis held in the proper position, and if the wheel C has but twelve teeth,to give time and space for this movement between the last day of onemouth and the irst day of the succeeding month.

One extra tooth, in addition to thirty-one, is all that is necessary toaccomplish this result; but the same rcsult can be obtained with morethan one extra tooth, if desired.

The wheel C is provided'with a number of pins, l,

each month, before one having less than thirty-one days, the pawl 'a a',when released from the piu b, shall have its end a fall against theproper one ofthem to regulate the position of the pawl, so that itshallrbe taken up by the pin b at the proper time to give the rightnumber of days in the following month.

There is one of these pins for each month in the four years that hasless than thirty-one days.

Those on the circle l are for the thirty-day months.

February in leap-year, and the three others, n, are for the month ofFebruary in the other three years.

rIhe position of these pins over the wheel D is shown by the smallvredcircles in Eg. 2.

g is a pi-nion, carried round upon an arm attached to the wheel D, andgearing into the wheel O.' This pinion, at each revolution of D, engageswith the pin E is a twenty-four hour wheel, forming part of or m, u,&c.,^placed in such positions that, at the end of The one, n1., nearerthe center, is for the month of Y h, and moves the wheel C forward onetooth upon the wheel D.

With the exception of this differential movement at the end of eachmonth, the wheels D and C re'volve together'.

f is a spring, one end of which is attac-hed to the wheel D, and theother' presses upon the teeth of G, in order to keep the wheelstogether, except when moved by the pin h.

Aiis 'a spring, one end of which is secured to the clock-frame, and theother presses against the teeth of the wheel D to keep it in itsposition when not operated upon by the pins b or o.

The axis upon which the wheel D is fixed works inside of that of thewheel C, and'inside of both are the arbors for the hands of the clock BB'.

To attach the index or pointer rmly to the socket, forming the axis ofD, it has a male projec tion or key, k, which fits int-o a slot, j, cutin the socket.

The operation of my invention is as follows:

The wheel E, in revolving, moves the month-wheel D one tooth each day,by means of the pin c, until it comes to the end of the month, when thepin b takes up the extra teeth and brings the month-wheel again to itsstarting point.

When the month has thirty-one days, the pawl a falls against the stop llat the end of the previous month, in which position the end a' is takenup by the pin b at the end of the thirty-first revolution of E, andcarried forward against the spring e till the end a strikes against theaxis on which the wheels turn, or the arui a' may strike a pin or othersuitable stop on wheel D, when the pawl stops, and the pin b carries thewheel D over the thirty-second tooth at the' same time that the pin hengages one of the leaves of the pinion g, and moves the year-wheel onetooth forward.

If the next month has thirty days, the end a ofthe pawl is left restingunder one of the `pins in the circle l, which is placed in the properposition to receive it and raise the end a so that it shall be one toothin advance of where it was before.

This causes the pawl to be taken up by the pin b one revolution of Esooner than before, and the index passes over two teeth at once by meansof the paw-l, instead of one, as before.

The year-wheel is also moved one tooth as the pinion g passes the pin h.

When the month has twenty -nine or twentyeight daysthe end a' of thepawl is raised the proper A number of teeth higher, so as to carry thewheel D over the extra teeth by being caught by the pin b so manyrevolutions of E sooner.

By means of this arrangement the month always commences at the samepoint of the wheel D, and brings the index to the ligure 1 upon thedial.

The differential movement of the two wheels D and C takes place whilethe index is moving from the blank space after the 31 to the pointmarked l, so

that the pawl is always left in the proper position to be taken up bythe pin b at the end of the month. If desired the wheel C can be madewith twelve teeth and live pins for the short months in the year, andrevolve upon the wheel D once in twelve months instead of forty-eight.

In this case the dial A will be marked with twelve months instead offorty-eight, and if desired to use,

calendar the leap' this arrangement for a perpetual year index and itsproper mechanism can be arranged separately. .A

The pawl a, a' can. also be made to work upon the under side of wheel D,and have the part that rests upon the pins l m n, &c., project throughan aperture in the wheel.

.In orderto set the calendar after the clock has been stopped, all thatis necessary is to set the long arm of the index upon the day of themonth and turn the month-dial, attached to the year-wheel, round untilthe proper month of the proper year relative to leapyear comes under theshort arm of the index, or, by merely turning the month indicator eitherforward or backward until the proper month of the proper year relativeto leap-year comes under the short arm of the index, stopping the same.with the long arm over the proper day of the month. rI'he calendar willthen go on correctly to the end of the mouth, and, if it has thirty-onedays, will pass on to the next month correctly.

If, however, it be a short month, the index will have to be movedforward from the last day of the month to the first of the next or thesame number of days upon the dial at any time thereafter, when thecalendar will continue on correctly as long as the clock runs.

The reason of this is that, after turning round the wheels C and D, thepawl does not rest upon any of the pins and the month registersthirty-one days, as before described.

If in any short month it is desired to set the calendar so that it willcontinue correctly thereafter, the index can be set to the last day ofthe preceding month and the clock turned forward twenty-four hours, whenthe point-er can be moved till the index arrives at the proper day. Thiswill leave the pawl in the right position at the end of the month.

It will be observed that the index cannot be moved at or near twelveoclock at night, as at that time the the pin c is engaged with the teethof wheel D and prevents its movement. The hands of the clock are soplaced that the calendar changes at twelve midnight.

My improved calendar can be attached to the dial of a clock, the wheelstuming upon the same center as the hands, as in the drawing, or it maybe placed at any other part of the clock-case and operated by a wueelsimilar to E, or by a rod having pins upon it to perform the samefunctions as b and c.

As arranged the leap-year dial is indicated upon the same dial as themonths of the year, but for the purpose of merely showing the yearrelative to leap-` year, and thereby enabling the calendar to be set inthe proper year. This dial might be arranged by itself with any properindex or point-er, when the same result would be accomplished. Insteadof making this dial leap-year, fil-st, second," and third year after,the same might be indicated by l 2 3 4.

The end of the pawl a, instead of working against pins in the wheel C,can be made to enter into slots or grooves cut in that wheel, and canalso, if desired, be made to followagainst whatever kind of stops may beused, so that, wherever the calendar may be set, whether the month hasthirty-one days or less, it will continue to indicate correctly as longas the clock runs.

My invention can also be so arranged that it can be used with a systemof revolving disks, marked with the names of the months and days, sothat the number of the day and the name of the mouth shall show throughopenings in the face or other part ofthe clock.

The advantages of my invention are that it has much less machinery, ismore simple, and less liable to get out of order than calendars now inuse; that it can be used on the same center as the hands of the clock,and applied to clocks of small size, which is not the ease with others;that it can be easily regulated and set; that it indicates the yearrelative to leapyear, so that the calendar may be set for the right yearwithout necessitating the turning of the calendar mechanism through theother years that may intervene; that it may be set by simply turning theindicators to the right position; that the indicators may be turnedeither forward or backward indiierently and indefinitely withoutdamaging or disarrangng the calendar; and that it runs correctly inwhatever position it may be started, obviating the most seriousobjection to the use of other calendars-that they require a skilledmechanic to keep them in order and set them when the clock stops.

I claim as my invention- 1. The month-wheel D, constructed with an extratooth in addition to thirty-one, as described, in combinationwith theoperating mechanism which moves the month-wheel D forward at the end ofthe months, for the purpose of moving said wheel over a space equal totwo or more of its teeth at the end of every month, substantially asdescribed.

2. The arrangement of the pin h and pinion g, or their equivalents, inrelation to the wheels D C, revolving together as described, so that thedifferential movement between the wheels shall take place at the end ofeach month, as herein specified.

3. The combination of the disk A with the wheel O, pins b and c, thepawl a a', the stops d l m n, &c., the wheel D, the pinion g or itsequivalent, and the pin h, constructed and operating substantially asdescribed. v

4. The combination of the disk A (having the months of the year markedthereon) and the pointer B, combined and operating together within acircle of igures representing the days of the months, so that the samepointer shall indicate the month and the day of the month, substantiallyas described.

5. The combination of the pin b, or its equivalent, with the dog or pawla a', the stops d l m n, &c., and the wheels D and G, each revolvingupon a stationary axis and all operating together, substantially asdescribed.

6. The combination of the parts named in claim 5, pinion g, and pin h,whereby the vchanges of the wheel C, which operates the month,indicator, shall take place between the last day of one month and theiirst day of the next month, substantially as described.

7. The combination of a leap-year indicator, andits operating mechanism,with a clock-calendar movement, combined and-operatingtogethervsubstantially as described, so that the elative position oftheparts of said operating .mechanism is indicated upon the dial byindicating the year relative to leap-year, for the purpose of moreconveniently setting the calendar, as herein described.

WILLIAM A. TERRY.

Witnesses:

C. A. SHEPARD, Jantes SHEPARD.

